Reading through the list it looks like it’s not the kernel that’s being discussed, and this comment implies to me that it’s after much of the C system is built,

Reading through the list it looks like it’s not the kernel that’s being discussed, and this comment implies to me that it’s after much of the C system is built, “ imp suggested adding an additional step after buildworld for stuff that requires an external toolchain”. It’s been a while since I’ve worked with FreeBSD, but I think buildworld includes linking, which would imply to me that you couldn’t link Rust into portions of the system in that stage?